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scala - 从 ZIO (Scala) 获取 ZManaged 的​​类型转换

问题描述

我需要帮助将 ZIO[WsConfig, Throwable, A] 类型的值转换为 ZManaged[A] 有下一个代码（我可以在 IDEA 中构建它，没有与类型相关的错误，根本没有），但我有 ??? 就在原地。

    def poolCache(implicit tag: Tagged[UcpZLayer.Service]): ZLayer[ZenvLogConfCache_, Throwable, UcpZLayer] = {

      val zm: ZIO[WsConfig, Throwable, ZManaged[Any, Throwable, UcpZLayer.Service]] =
        for {
          conf <- ZIO.environment[WsConfig]
          cpool <- Ref.make(new OraConnectionPool(conf.dbconf, conf.ucpconf))
          acquire = ZIO(new poolCache(cpool))
          release: (UcpZLayer.Service => zio.ZIO[Any,Nothing,Any]) = (pc: UcpZLayer.Service) => pc.closeAll
          zm: ZManaged[Any, Throwable, UcpZLayer.Service] = ZManaged.make(acquire)(release)
        } yield zm

      val managedConnPool: ZManaged[Any, Throwable, UcpZLayer.Service] = ???

      ZLayer.fromManaged(managedConnPool)
    }

可能会有所帮助-我用来生成 ZLayer 的这种方法 poolCache

object EnvContainer {
  type IncConnSrvBind = akka.stream.scaladsl.Source[IncomingConnection, Future[ServerBinding]]

  type ZEnvLog = ZEnv with Logging
  type ZEnvLogCache =  ZEnvLog with CacheManager
  type ZenvLogConfCache_ =  ZEnvLogCache with config.Config[WsConfig]
  type ZEnvConfLogCache =  ZEnvLogCache with config.Config[WsConfig] with UcpZLayer

   val envLog: ZLayer[Console with Clock, Nothing, Logging]   =
    Logging.console((_, logEntry) =>
      logEntry
    )

  val ZEnvLogLayer:  ZLayer[ZEnv, Nothing, ZEnvLog] = ZEnv.live ++ envLog

  val ZEnvLogCacheLayer: ZLayer[ZEnv, Nothing, ZEnvLogCache] =
    ZEnv.live ++ envLog ++ CacheManager.refCache

  def ZEnvConfLogCacheLayer(confFileName: String): ZLayer[ZEnv, Throwable, ZEnvConfLogCache] = {
    val confLayer = configLayer(confFileName)
    val combEnvWithoutPool = ZEnv.live ++ envLog ++ confLayer ++ CacheManager.refCache
    combEnvWithoutPool ++ (combEnvWithoutPool >>> Ucp.UcpZLayer.poolCache)
  }

}

我将任何 ZLayers（带 confLayer）与 ++ 水平组合，并通过 >>> 传递到 poolCache。

标签： scalazio

解决方案

我建议改为这样做：

    def poolCache(implicit tag: Tagged[UcpZLayer.Service]): ZLayer[ZenvLogConfCache_, Throwable, UcpZLayer] =
      (for {
        // Use a Managed directly when access then environment
        // `access` will remove the `Has` wrapping.
        conf  <- ZManaged.access[Config[WsConfig]](_.get)

        // Convert the effect into a no-release managed
        cpool <- Ref.make(new OraConnectionPool(conf.dbconf, conf.ucpconf)).toManaged_

        // Create the managed
        zm    <- ZManaged.make(ZIO(new poolCache(cpool)))(_.closeAll)
      } yield zm).toLayer // Convert a `Managed` to `ZLayer` directly

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